U2 was prepared to start the concert at The Globen arena but did not take stage when the announcement was made for fans to evacuate.

"Due to a security breach, Stockholm's The Globen evacuated the audience from the building this evening," the band said in a statement on its website. "As the breach has not been resolved quickly and as audience safety is paramount, the police have advised The Globen and Live Nation that they have no option but to postpone tonight's show, to a rescheduled date of Tuesday 22nd September."

The band stated on its website that all of the tickets purchased for Sunday's concert would be honored at Tuesday's show.The Daily Mail quoted the Swedish newspaper Aftonbladet, which reported that the incident involved a police officer who forgot to leave his gun at work. Stockholm police spokesperson Towe Hagg told Aftonbladet that an investigation into a firearms violation was ongoing.

The crowd filled the arena at 8 p.m. and waited for two and a half hours before the venue was ordered to evacuate, according to the Daily Mail. Authorities then began a sweep of the building after the concert was canceled.

The concert was part of U2's seven-month "Innocence and Experience" tour to promote the band's "Songs of Innocence" album.

The top-selling U2 is slated to appear in Berlin for three shows beginning Friday and going on through Sept. 28 and 29, according to the band's website. From there, the band will move on Barcelona, Antwerp, Belgium, and Cologne, Germany, before playing six shows at the O2 Arena in London from Oct. 25 to Nov. 3.